If your name shows up in the output of ls -la /media/320\ Gigabyte/Mac\ Mini\ Home\ Folder\ Backup/'
you own the files. I think the owner's and group's names are in the 4th and 5th columns of the listing.
What is the output ofchmod --recursive 755 /media/320\ Gigabyte/Mac\ Mini\ Home\ Folder\ Backup/'
This 'chmod' command sets permissions such that you can do everything to the files, but your group and all other users can only read and execute.
